Colour space

Colour space

Colour space is the range of colours that can be produced by the primary colours. RGB stands for the red, green and blue that is present in a colour. Different percentages of RGB make different colours occur. There can be 16,777,216 different colours on the screen by mixing the different ratios together. sRGB is the term that was produced by HP and Microsoft 1977. It stands for standard red green and blue. AdobeRGB was a term that was created by adobe to explain their standard colour gamut.

Gray scale is what is used to describe the colours of black and white only being used at the same time to create an image.

YUV

The y stand for luma, which is the brightness of an image. The U and V provide colour information and are colour difference signals of blue minus luma and red minus luma through a process called a color space conversion. The signals are given in YPbPr, they have to be converted back to RGB by the display monitor.

Luminance: This is the photometric measure of the luminous intensity per area of light travelling in a certain direction. It explains the amount of light that passes trough, is reflected or emitted from a particular area. The SI units are (cd/m²).

chrominance: This is a short signal that is used inside video systems to convey the colour information. It is represented as two colour difference components, blue luma and red luma.

YUV also saves transmission bandwidth compared to RGB as chroma only send half the resolution as luma.

HSV stands for hue, saturation and value.  cylindrical coordinate representations of points in an RGB colour mode.

Hue: This is the wavelength within the visible light spectrum at which the energy output from a source is greatest.

Saturation: Saturation is an expression for the relative bandwidth of the visible output from a light source.

Value: This is an example of the expression of the intensity of the energy output of a visible light source.